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conn_id_generator_test.go
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package quic
import (
"fmt"
"github.com/lucas-clemente/quic-go/internal/protocol"
"github.com/lucas-clemente/quic-go/internal/qerr"
"github.com/lucas-clemente/quic-go/internal/wire"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
var _ = Describe("Connection ID Generator", func() {
var (
addedConnIDs []protocol.ConnectionID
retiredConnIDs []protocol.ConnectionID
removedConnIDs []protocol.ConnectionID
replacedWithClosed map[string]packetHandler
queuedFrames []wire.Frame
g *connIDGenerator
)
initialConnID := protocol.ConnectionID{1, 2, 3, 4, 5, 6, 7}
initialClientDestConnID := protocol.ConnectionID{0xa, 0xb, 0xc, 0xd, 0xe}
connIDToToken := func(c protocol.ConnectionID) protocol.StatelessResetToken {
return protocol.StatelessResetToken{c[0], c[0], c[0], c[0], c[0], c[0], c[0], c[0], c[0], c[0], c[0], c[0], c[0], c[0], c[0], c[0]}
}
BeforeEach(func() {
addedConnIDs = nil
retiredConnIDs = nil
removedConnIDs = nil
queuedFrames = nil
replacedWithClosed = make(map[string]packetHandler)
g = newConnIDGenerator(
initialConnID,
initialClientDestConnID,
func(c protocol.ConnectionID) { addedConnIDs = append(addedConnIDs, c) },
connIDToToken,
func(c protocol.ConnectionID) { removedConnIDs = append(removedConnIDs, c) },
func(c protocol.ConnectionID) { retiredConnIDs = append(retiredConnIDs, c) },
func(c protocol.ConnectionID, h packetHandler) { replacedWithClosed[string(c)] = h },
func(f wire.Frame) { queuedFrames = append(queuedFrames, f) },
protocol.VersionDraft29,
)
})
It("issues new connection IDs", func() {
Expect(g.SetMaxActiveConnIDs(4)).To(Succeed())
Expect(retiredConnIDs).To(BeEmpty())
Expect(addedConnIDs).To(HaveLen(3))
for i := 0; i < len(addedConnIDs)-1; i++ {
Expect(addedConnIDs[i]).ToNot(Equal(addedConnIDs[i+1]))
}
Expect(queuedFrames).To(HaveLen(3))
for i := 0; i < 3; i++ {
f := queuedFrames[i]
Expect(f).To(BeAssignableToTypeOf(&wire.NewConnectionIDFrame{}))
nf := f.(*wire.NewConnectionIDFrame)
Expect(nf.SequenceNumber).To(BeEquivalentTo(i + 1))
Expect(nf.ConnectionID.Len()).To(Equal(7))
Expect(nf.StatelessResetToken).To(Equal(connIDToToken(nf.ConnectionID)))
}
})
It("doesn't issue new connection IDs in RetireBugBackwardsCompatibilityMode", func() {
RetireBugBackwardsCompatibilityMode = true
defer func() { RetireBugBackwardsCompatibilityMode = false }()
Expect(g.SetMaxActiveConnIDs(4)).To(Succeed())
Expect(retiredConnIDs).To(BeEmpty())
Expect(addedConnIDs).To(BeEmpty())
})
It("limits the number of connection IDs that it issues", func() {
Expect(g.SetMaxActiveConnIDs(9999999)).To(Succeed())
Expect(retiredConnIDs).To(BeEmpty())
Expect(addedConnIDs).To(HaveLen(protocol.MaxIssuedConnectionIDs - 1))
Expect(queuedFrames).To(HaveLen(protocol.MaxIssuedConnectionIDs - 1))
})
// SetMaxActiveConnIDs is called twice when we dialing a 0-RTT connection:
// once for the restored from the old connections, once when we receive the transport parameters
Context("dealing with 0-RTT", func() {
It("doesn't issue new connection IDs when SetMaxActiveConnIDs is called with the same value", func() {
Expect(g.SetMaxActiveConnIDs(4)).To(Succeed())
Expect(queuedFrames).To(HaveLen(3))
queuedFrames = nil
Expect(g.SetMaxActiveConnIDs(4)).To(Succeed())
Expect(queuedFrames).To(BeEmpty())
})
It("issues more connection IDs if the server allows a higher limit on the resumed connection", func() {
Expect(g.SetMaxActiveConnIDs(3)).To(Succeed())
Expect(queuedFrames).To(HaveLen(2))
queuedFrames = nil
Expect(g.SetMaxActiveConnIDs(6)).To(Succeed())
Expect(queuedFrames).To(HaveLen(3))
})
It("issues more connection IDs if the server allows a higher limit on the resumed connection, when connection IDs were retired in between", func() {
Expect(g.SetMaxActiveConnIDs(3)).To(Succeed())
Expect(queuedFrames).To(HaveLen(2))
queuedFrames = nil
g.Retire(1, protocol.ConnectionID{})
Expect(queuedFrames).To(HaveLen(1))
queuedFrames = nil
Expect(g.SetMaxActiveConnIDs(6)).To(Succeed())
Expect(queuedFrames).To(HaveLen(3))
})
})
It("errors if the peers tries to retire a connection ID that wasn't yet issued", func() {
Expect(g.Retire(1, protocol.ConnectionID{})).To(MatchError(&qerr.TransportError{
ErrorCode: qerr.ProtocolViolation,
ErrorMessage: "retired connection ID 1 (highest issued: 0)",
}))
})
It("errors if the peers tries to retire a connection ID in a packet with that connection ID", func() {
Expect(g.SetMaxActiveConnIDs(4)).To(Succeed())
Expect(queuedFrames).ToNot(BeEmpty())
Expect(queuedFrames[0]).To(BeAssignableToTypeOf(&wire.NewConnectionIDFrame{}))
f := queuedFrames[0].(*wire.NewConnectionIDFrame)
Expect(g.Retire(f.SequenceNumber, f.ConnectionID)).To(MatchError(&qerr.TransportError{
ErrorCode: qerr.ProtocolViolation,
ErrorMessage: fmt.Sprintf("retired connection ID %d (%s), which was used as the Destination Connection ID on this packet", f.SequenceNumber, f.ConnectionID),
}))
})
It("doesn't error if the peers tries to retire a connection ID in a packet with that connection ID in RetireBugBackwardsCompatibilityMode", func() {
Expect(g.SetMaxActiveConnIDs(4)).To(Succeed())
Expect(queuedFrames).ToNot(BeEmpty())
Expect(queuedFrames[0]).To(BeAssignableToTypeOf(&wire.NewConnectionIDFrame{}))
RetireBugBackwardsCompatibilityMode = true
defer func() { RetireBugBackwardsCompatibilityMode = false }()
f := queuedFrames[0].(*wire.NewConnectionIDFrame)
Expect(g.Retire(f.SequenceNumber, f.ConnectionID)).To(Succeed())
})
It("issues new connection IDs, when old ones are retired", func() {
Expect(g.SetMaxActiveConnIDs(5)).To(Succeed())
queuedFrames = nil
Expect(retiredConnIDs).To(BeEmpty())
Expect(g.Retire(3, protocol.ConnectionID{})).To(Succeed())
Expect(queuedFrames).To(HaveLen(1))
Expect(queuedFrames[0]).To(BeAssignableToTypeOf(&wire.NewConnectionIDFrame{}))
nf := queuedFrames[0].(*wire.NewConnectionIDFrame)
Expect(nf.SequenceNumber).To(BeEquivalentTo(5))
Expect(nf.ConnectionID.Len()).To(Equal(7))
})
It("retires the initial connection ID", func() {
Expect(g.Retire(0, protocol.ConnectionID{})).To(Succeed())
Expect(removedConnIDs).To(BeEmpty())
Expect(retiredConnIDs).To(HaveLen(1))
Expect(retiredConnIDs[0]).To(Equal(initialConnID))
Expect(addedConnIDs).To(BeEmpty())
})
It("handles duplicate retirements", func() {
Expect(g.SetMaxActiveConnIDs(11)).To(Succeed())
queuedFrames = nil
Expect(retiredConnIDs).To(BeEmpty())
Expect(g.Retire(5, protocol.ConnectionID{})).To(Succeed())
Expect(retiredConnIDs).To(HaveLen(1))
Expect(queuedFrames).To(HaveLen(1))
Expect(g.Retire(5, protocol.ConnectionID{})).To(Succeed())
Expect(retiredConnIDs).To(HaveLen(1))
Expect(queuedFrames).To(HaveLen(1))
})
It("retires the client's initial destination connection ID when the handshake completes", func() {
g.SetHandshakeComplete()
Expect(retiredConnIDs).To(HaveLen(1))
Expect(retiredConnIDs[0]).To(Equal(initialClientDestConnID))
})
It("removes all connection IDs", func() {
Expect(g.SetMaxActiveConnIDs(5)).To(Succeed())
Expect(queuedFrames).To(HaveLen(4))
g.RemoveAll()
Expect(removedConnIDs).To(HaveLen(6)) // initial conn ID, initial client dest conn id, and newly issued ones
Expect(removedConnIDs).To(ContainElement(initialConnID))
Expect(removedConnIDs).To(ContainElement(initialClientDestConnID))
for _, f := range queuedFrames {
nf := f.(*wire.NewConnectionIDFrame)
Expect(removedConnIDs).To(ContainElement(nf.ConnectionID))
}
})
It("replaces with a closed session for all connection IDs", func() {
Expect(g.SetMaxActiveConnIDs(5)).To(Succeed())
Expect(queuedFrames).To(HaveLen(4))
sess := NewMockPacketHandler(mockCtrl)
g.ReplaceWithClosed(sess)
Expect(replacedWithClosed).To(HaveLen(6)) // initial conn ID, initial client dest conn id, and newly issued ones
Expect(replacedWithClosed).To(HaveKeyWithValue(string(initialClientDestConnID), sess))
Expect(replacedWithClosed).To(HaveKeyWithValue(string(initialConnID), sess))
for _, f := range queuedFrames {
nf := f.(*wire.NewConnectionIDFrame)
Expect(replacedWithClosed).To(HaveKeyWithValue(string(nf.ConnectionID), sess))
}
})
})